Complexes of D-, L-, DL-, and meso-tartaric acid with hydrogen and oxovanadium(IV) cations
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 4,p. 286-290
- https://doi.org/10.1039/dt9780000286
Abstract
The formation constants of the complexes of D-, L-, DL-, and meso-tartaric acid (H2L) with the hydrogen ion and the oxovanadium(IV) cation, [VO]2+, have been measured potentiometrically at 25.0 °C and I= 0.10 mol dm–3(K[NO3]). The enthalpy changes on formation of the protonated tartaric acids have been measured calorimetrically under identical conditions. The existence of binuclear complexes of both optically active and, to a lesser extent, meso-tartaric acids with [VO]2+ has been confirmed. With active tartaric acids the major species at pH >6 is [(VO)2{D(or L)-L}2H–4]4–, but with meso-tartaric acid this species is of minor importance as a result of conformational differences. The binuclear complex [(VO)2(D-L)(L-L)H–4]4– is significantly more stable than [(VO)2-(D-L)2H–4]4–. This may be explained as resulting from conformational differences.Keywords
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